326 SHELLS AND SHELL-FISH. PART II. 



contracted and produced into two long beak-like pro- 

 cesses ; aperture effuse ; the outer lip inflected^ but 

 not toothed. 



B. volva. En. Meth. 357. f. 3. 



Carinea Sw. Oblong ; the extremities not 

 produced ; aperture nearly straight^ almost 

 central, contracted above, and very effuse ' 

 below ; lips equal ; the outer slightly 

 toothed. 



C. gibbosa. En. Meth. 357. f. 4. (fg. 93- ) 



Volvaria Lam. Cylindrical ; lengthened ; the ex- 

 tremities obtuse ; the surface sculptured ; base of the 

 pillar with 3^5 distinct plaits ; outer lip crenated ; 

 aperture linear ; fossil. 



V. concinna. Sow. Man. f. 439. (fg. 94. o.) 



Oylindbella Sw. Cylindrical, narrow, and 

 obtuse, as in Volvaria ; but the surface 

 and outer lip are smooth, and there are 

 no plaits on the pillar. 



C. alba Sw. {jig. 94. h. ) 



Erato Risso. Ovate, more or less angulated, smooth 

 or granulated, with a dorsal scar, short spire, and 

 large, angulated, emarginated aperture ; pillar slightly 

 crenated ; outer lip reflected, and denticulated on the 

 inner edge ; sutures covered with enamel.* 

 E. Maugeri. Sow. Man. 43. f. 454. 



Order PHYTOPHAGA. 



Family 1. HELICID^. Snails, 



Animal pulmonary ; breathing by a lateral opening ; 

 shell light, turbinated, or spiral ; the aperture always 



* I have not seen this curious little genus. Mr. Sowerby, in addition to the 

 above, adds, " it resembles Marginella, but has no folds on the pillar. Hav- 

 ing a groove down the back, he considers it intermediate between Margi- 

 nella and Cyprcea,'' (or rather Trivea). The circle of the CyprceidcE is 

 thus closed, and its union with the Volutidce at once established. 



